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import errno
import logging
import os
import random
import shutil
import stat
import string
import sys
import six
import libarchive
import libarchive._libarchive as _libarchive
logger = logging.getLogger(__name__)
GZIP = 'gzip'
ZSTD = 'zstd'
ENCODING = 'utf-8'
class ConfigureError(Exception):
pass
class Level(object):
def __init__(self, level):
self.level = level
class Compression(object):
Fast = Level(1)
Default = Level(2)
Best = Level(3)
def get_compression_level(filter_name, l):
if l is None or not filter_name:
return None
elif isinstance(l, Level):
l = {
GZIP: {
Compression.Fast: 1,
Compression.Default: 6,
Compression.Best: 9,
},
ZSTD: {
Compression.Fast: 1,
Compression.Default: 3,
Compression.Best: 22,
}
}[filter_name][l]
return l
def encode(value, encoding):
return value.encode(encoding)
def extract_tar(tar_file_path, output_dir):
output_dir = encode(output_dir, ENCODING)
_make_dirs(output_dir)
with libarchive.Archive(tar_file_path, mode="rb") as tarfile:
for e in tarfile:
p = e.pathname
dest = os.path.join(output_dir, encode(p, ENCODING))
if p.endswith("/"):
_make_dirs(dest)
continue
_make_dirs(os.path.dirname(dest))
if e.ishardlink():
_hardlink(os.path.join(output_dir, e.hardlink), dest)
continue
if e.issym():
_symlink(e.linkname, dest)
continue
with open(dest, 'wb') as f:
if hasattr(os, 'fchmod'):
os.fchmod(f.fileno(), e.mode & 0o7777)
libarchive.call_and_check(_libarchive.archive_read_data_into_fd, tarfile._a, tarfile._a, f.fileno())
def tar(paths, output, compression_filter=None, compression_level=None, fixed_mtime=None, onerror=None, postprocess=None, dereference=False):
if isinstance(paths, six.string_types):
paths = [paths]
if isinstance(output, six.string_types):
temp_tar_path, stream = output + "." + "".join(random.sample(string.ascii_lowercase, 8)), None
else:
temp_tar_path, stream = None, output
compression_level = get_compression_level(compression_filter, compression_level)
try:
if compression_filter:
filter_name = compression_filter
if compression_level is not None:
filter_opts = {"compression-level": str(compression_level)}
else:
filter_opts = {}
# force gzip don't store mtime of the original file being compressed (http://www.gzip.org/zlib/rfc-gzip.html#file-format)
if fixed_mtime is not None and compression_filter == GZIP:
filter_opts["timestamp"] = ""
else:
filter_name = filter_opts = None
with libarchive.Archive(stream or temp_tar_path, mode="wb", format="gnu", filter=filter_name, filter_opts=filter_opts, fixed_mtime=fixed_mtime) as tarfile:
# determine order if fixed_mtime is specified to produce stable archive
paths = paths if fixed_mtime is None else sorted(paths)
for p in paths:
if type(p) == tuple:
path, arcname = p
else:
path, arcname = p, os.path.basename(p)
if os.path.isdir(path):
for root, dirs, files in os.walk(path, followlinks=dereference):
if fixed_mtime is None:
entries = dirs + files
else:
entries = sorted(dirs) + sorted(files)
reldir = os.path.relpath(root, path)
for f in entries:
_writepath(tarfile, os.path.join(root, f), os.path.normpath(os.path.join(arcname, reldir, f)), onerror, postprocess, dereference)
else:
if not os.path.exists(path):
raise OSError("Specified path doesn't exist: {}".format(path))
_writepath(tarfile, path, arcname, onerror, postprocess, dereference)
if temp_tar_path:
os.rename(temp_tar_path, output)
except Exception:
if temp_tar_path and os.path.exists(temp_tar_path):
os.remove(temp_tar_path)
raise
def _writepath(tarfile, src, dst, onerror, postprocess, dereference):
def tar_writepath(src, dst):
st = os.lstat(src)
if stat.S_ISREG(st.st_mode) or stat.S_ISDIR(st.st_mode) or stat.S_ISLNK(st.st_mode):
if dereference and stat.S_ISLNK(st.st_mode):
src = os.path.realpath(src)
tarfile.writepath(src, dst)
if postprocess:
postprocess(src, dst, st.st_mode)
else:
logger.debug("Skipping non-regular file '%s' (stat: %s)", src, st)
try:
return tar_writepath(src, dst)
except Exception as e:
if isinstance(e, OSError) and e.errno == errno.ENOENT:
logger.debug("Skipping missing file '%s' - looks like directory content has changed during archiving", src)
return
if onerror:
if onerror(src, dst, sys.exc_info()):
return tar_writepath(src, dst)
else:
raise
def check_tar(tar_file_path):
if os.path.isfile(tar_file_path) or os.path.islink(tar_file_path):
return libarchive.is_archive(tar_file_path)
return False
def _make_dirs(path):
try:
os.makedirs(path)
except OSError as e:
if e.errno != errno.EEXIST or not os.path.isdir(path):
raise
def _hardlink(src, dst):
if hasattr(os, 'link'):
os.link(src, dst)
else:
shutil.copyfile(src, dst)
def _symlink(src, dst):
if hasattr(os, 'symlink'):
os.symlink(src, dst)
else:
# Windows specific case - we cannot copy file right now,
# because it doesn't exist yet (and would be met later in the archive) or symlink is broken.
# Act like tar and tarfile - skip such symlinks
if os.path.exists(src):
shutil.copytree(src, dst)
def get_archive_filter_name(filename):
filters = libarchive.get_archive_filter_names(filename)
# https://a.yandex-team.ru/arc/trunk/arcadia/contrib/libs/libarchive/libarchive/archive_read.c?rev=5800047#L522
assert filters[-1] == 'none', filters
if len(filters) == 1:
return None
if len(filters) == 2:
return filters[0]
raise Exception("Archive has chain of filter: {}".format(filters))
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